Specialize in a brand or category. For example, hey you want WE guns go to ABC shop. Hey you want CQB gear, go to XYZ shop. Don't be all things to all people as it spreads yourself too thin unless you're huge like TowerHobbies.
"...However, if preserving the integrity of the gun was the only factor at play then clearly the best option would be to run a 0.0v Lipo and run around shouting 'bang'."